Correct the addition of a key and the duplication of a variable name in Dictionary class documentation.
Correct the addition of a key and the duplication of a variable name
in Dictionary class documentation.

josempans/godot,firefly2442/godot,Zylann/godot,Faless/godot,Zylann/godot,josempans/godot,josempans/godot,pkowal1982/godot,pkowal1982/godot,akien-mga/godot,DmitriySalnikov/godot,honix/godot,honix/godot,Zylann/godot,pkowal1982/godot,Faless/godot,firefly2442/godot,Faless/godot,guilhermefelipecgs/godot,Faless/godot,Valentactive/godot,Faless/godot,vnen/godot,godotengine/godot,vkbsb/godot,ZuBsPaCe/godot,pkowal1982/godot,Shockblast/godot,vnen/godot,akien-mga/godot,godotengine/godot,Zylann/godot,Shockblast/godot,DmitriySalnikov/godot,ZuBsPaCe/godot,Zylann/godot,DmitriySalnikov/godot,sanikoyes/godot,MarianoGnu/godot,guilhermefelipecgs/godot,ZuBsPaCe/godot,honix/godot,firefly2442/godot,Paulloz/godot,Valentactive/godot,ZuBsPaCe/godot,DmitriySalnikov/godot,guilhermefelipecgs/godot,sanikoyes/godot,MarianoGnu/godot,vkbsb/godot,guilhermefelipecgs/godot,Faless/godot,ZuBsPaCe/godot,ZuBsPaCe/godot,godotengine/godot,BastiaanOlij/godot,vkbsb/godot,Valentactive/godot,sanikoyes/godot,firefly2442/godot,guilhermefelipecgs/godot,honix/godot,godotengine/godot,vnen/godot,Valentactive/godot,sanikoyes/godot,guilhermefelipecgs/godot,vnen/godot,Zylann/godot,honix/godot,pkowal1982/godot,BastiaanOlij/godot,Shockblast/godot,josempans/godot,BastiaanOlij/godot,josempans/godot,firefly2442/godot,Shockblast/godot,Valentactive/godot,Faless/godot,akien-mga/godot,vnen/godot,vkbsb/godot,Paulloz/godot,Shockblast/godot,Zylann/godot,Paulloz/godot,BastiaanOlij/godot,firefly2442/godot,DmitriySalnikov/godot,Paulloz/godot,BastiaanOlij/godot,Valentactive/godot,vkbsb/godot,vnen/godot,godotengine/godot,Faless/godot,guilhermefelipecgs/godot,vkbsb/godot,guilhermefelipecgs/godot,vnen/godot,sanikoyes/godot,Valentactive/godot,BastiaanOlij/godot,firefly2442/godot,Paulloz/godot,DmitriySalnikov/godot,Shockblast/godot,josempans/godot,pkowal1982/godot,MarianoGnu/godot,josempans/godot,sanikoyes/godot,godotengine/godot,Shockblast/godot,vnen/godot,Shockblast/godot,MarianoGnu/godot,BastiaanOlij/godot,honix/godot,sanikoyes/godot,pkowal1982/godot,akien-mga/godot,akien-mga/godot,sanikoyes/godot,MarianoGnu/godot,ZuBsPaCe/godot,vkbsb/godot,godotengine/godot,godotengine/godot,firefly2442/godot,akien-mga/godot,Zylann/godot,MarianoGnu/godot,Paulloz/godot,vkbsb/godot,Valentactive/godot,MarianoGnu/godot,josempans/godot,akien-mga/godot,akien-mga/godot,BastiaanOlij/godot,Paulloz/godot,DmitriySalnikov/godot,MarianoGnu/godot,ZuBsPaCe/godot,pkowal1982/godot